An airplanes altitude changed -531 feet over 9 minutes. what was the mean change of altitude in feet per minute.

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

Asalsa recipe uses green pepper, onion, and tomato in the extended ratio 3: 5: 7. how many cups of tomato are needed to make 105 cups of salsa? a. 7 b. 21 c. 35 d. 49